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Thermal Properties Of Trans-neptunian Objects And Centaurs From Combined Herschel And Spitzer Observations

Lellouch, E. and Santos-Sanz, P. and Mommert, M. and Fornasier, S. and Stansberry, J. and Müller, T. and Duffard, R. and Ortiz, J. and Kiss, C. and Vilenius, E. and Mueller, M. and Lacerda, P. and Harris, A. W. (2012) Thermal Properties Of Trans-neptunian Objects And Centaurs From Combined Herschel And Spitzer Observations. 44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society, 14.-19. Okt. 2012, Reno, NV.

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Abstract

We present a study of the thermal properties of about 70 trans-Neptunian objects (TNOs) and Centaurs observed with Herschel Space Observatory (either PACS or PACS/SPIRE) and Spitzer (MIPS). The combined wavelength range is 24-160 μm and additionally up to 500 μm for a few targets. We apply radiometric modeling techniques (NEATM) to the measured fluxes to derive diameter, albedo and beaming factor (η). The latter parameter is a proxy for the combined effects of surface thermal properties (thermal inertia), surface roughness, and rotation properties. We examine the results and search for trends in the inferred η values with several parameters, including heliocentric distance, albedo, and rotational properties. In particular, the distribution of η as a function of heliocentric distance reveals a large dispersion in the η values, but also shows that there are no objects with large beaming factors at low distances. This is an expected ensemble behaviour for a population of objects with low thermal inertia (probably less than 0-20 J m‑2 s‑1/2 K‑1), consistent with thermo-physical modeling of a few selected objects, which suggests that these objects are covered with low-conductivity regolith

Document Type:Conference or Workshop Item (Speech)
Title:Thermal Properties Of Trans-neptunian Objects And Centaurs From Combined Herschel And Spitzer Observations
Authors:
AuthorsInstitution or Email of Authors
Lellouch, E.Obs. de Paris, France
Santos-Sanz, P.Obs. de Paris, France
Mommert, M.michael.mommert@dlr.de
Fornasier, S.Obs. de Paris, France
Stansberry, J.UoA
Müller, T.MPE, Garching
Duffard, R.IAA, Spain
Ortiz, J.IAA, Spain
Kiss, C.Konkoly Obs., Hungary
Vilenius, E.MPE, Garching
Mueller, M.SRON, Netherlands
Lacerda, P.Queen's University, Belfast
Harris, A. W.alan.harris@dlr.de
Date:2012
Status:Published
Keywords:TNOs, thermal properties, eta
Event Title:44th annual meeting of the Division for Planetary Sciences of the American Astronomical Society
Event Location:Reno, NV
Event Type:international Conference
Event Dates:14.-19. Okt. 2012
Organizer:DPS
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):R - Vorhaben Exploration des Sonnensystems
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Asteroids and Comets
Deposited By: Michael Mommert
Deposited On:09 Nov 2012 10:05
Last Modified:09 Nov 2012 10:05

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